Demultiplexer based on an off-axis holographic lens with low monochromatic aberrations |
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| Authors: | Sensen Li Shou Liu Xiangsu Zhang Xuechang Ren |
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| Institution: | Sensen Li 1,Shou Liu 2,Xiangsu Zhang2,and Xuechang Ren2 1 Department of Electronic Engineering,Xiamen University,Xiamen 361005,China 2 Department of Physics,China |
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| Abstract: | A novel scheme is proposed,in which the aberrations in the off-axis holographic lenses used as demultiplex-ers are reduced to a low enough level for relatively small channel spacing. The scheme includes optimizing the recording and reconstruction geometries and collimating the reconstruction wave with a gradient-index lens. A demultiplexer operated in the 1 550-nm band with 5-nm channel spacing and ∞-dB crosstalk is obtained using the scheme. The channel spacing can be decreased to 2 nm by etching the cladding of the output fibers to a smaller size. |
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